GCF CI/CD: add cloudbuild.yaml (#3324)
GCF CI/CD: add cloudbuild.yaml (#3324)

* GCF CI/CD: add cloudbuild.yaml

* Use consistent region tags across languages
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples